An optional extra to add to a digital slide show is adding extra information to the image. If the images was taken using a digital camera, then the chances are that the date and time and exposure settings have been stored. But, from a digital competition point of view, you can add some useful information.
If you use Explorer to find your image, try right clicking the image. At the bottom of the menu that appears, there should be a properties option:

Select Properties, and you'll get a dialog box like this:

Click the Summary tab at the top of the dialog box; the box will change to look like this:

Now you can set the title of the image into the Title field and the Author name (ie your name) into the Author field. "What use is this?", I hear you ask. Both Film Free Projection and MediaPro can add the title and author to the slide show image so if the judge wants the title of an image to be displayed, then assuming this field has been correctly set, it will be displayed at the base of the image.